MH-MX8 Wireless Bluetooth（BLT 4.2 ） MP3 Audio Receiver board
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Purchase Link: Aliexpress:MH-ET LIVE Official Store
Product introduction
MH-M18/M28/M38 is a low-power Bluetooth design solution that supports the latest Bluetooth 4.2 transmission, two-channel stereo lossless playback, and Bluetooth wireless transmission when the module is connected to Bluetooth, which is very convenient. In an open environment, the Bluetooth connection distance can be up to 20 meters.Widely used in a variety of Bluetooth audio reception, a variety of audio DIY modification.For your different needs, we offer 3 versions for you to choose from:
Function /Pin definition
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Bluetooth V4.2 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual channel output.
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After the module is powered on, the mobile phone searches for the Bluetooth name MH-M18/MH-M28/MH-M38, and can play music after connecting Bluetooth.
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module blue indicator light:
When the Bluetooth is not connected, the indicator light flashes quickly;
When the Bluetooth connection is on, the indicator light is always on;
The following is an introduction to each version: -
MH-M18:
PCB size: 23162.5mm (length, width and height)
Pin pitch: 2.54mm (can be directly attached or soldered)
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MH-M28:
Power supply: You can directly use the MICRO USB Android cable 5V for direct power supply, or you can also connect 5V power supply or 3.7V lithium battery (as shown below). Note that the 5V and 3.7V power supply interfaces are different. The 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.
Audio output: The earphone can be directly connected to the 3.5mm audio interface, or it can be wired for the audio input of the power amplifier board (the interface L/R/AGND can be directly wired as shown).
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MH-M38:
Power supply: You can directly use the MICRO USB Android cable 5V for direct power supply, or you can also connect 5V power supply or 3.7V lithium battery (as shown below). Note that the 5V and 3.7V power supply interfaces are different. The 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.
The maximum operating current is 5V2A. It is recommended to use a regulated 5V2A power supply for better sound quality.
Support USB sound card, free drive (plug and play). Connect the module to the computer with a USB cable, and the computer can play music through the module amplifier output.
Audio output: output left and right stereo audio signals, which can be connected to two 2-8 ohm, 3-5W speakers, and 4 Euro 5W speakers.
5W power amplifier on board :This product has its own dual 5W power amplifier circuit, and must not be connected to another amplifier! The outputs of the two amplifiers may not be connected in parallel or the negative poles may be connected together, otherwise the power amplifier chip may be damaged.
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mh-m18 when idle the device goes to sleep. How to fix it?
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Does the MH-M28 support charging lithium battery too?
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@johnadib No.You can use the MH-CD42 for charging.
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@andrey Sorry, the function is designed like this. Only power on again.
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@jane-kaze NO,no AT support.
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@mh-et-live This M18 have an ATCommand Support? and What is Pin No. for Tx Rx?
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What are the 4 extra pins on the M18 for?
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@arroquw The are use for Factory test. Ignore them!
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Alright. Also, where is pin 1 on the M18? Near the factory test pins or at the other end? I couldn't find this in the description.
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@arroquw Near the test pins.
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I cannot use modules in my production because I cannot turn off sleep mode! :(
Maybe there is an opportunity to change the firmware with corrections?
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@MH-ET-LIVE For M38 module, how can I reduce the pairing/unpairing sounds volume. Seems like is at 100%. I would like to set it at 25%. Is this possible. Thanks!
